Fragment of lunar sample (moon rock), NASA No.61016.116 (011) and box, weight of rock 89 grams, collected by Apollo 16 crewmember Charles Duke on the east rim of Plum Crater 1500 meters west of the landing site, 1972.
This fragment is 3.97+/-0.25 billion years old. This is older than most of the surface rock on earth. This fragment is part of a large 11.7 kilogram rock known as "Big Muley", the largest rock collected on the Apollo missions. The rock is impact breccia (fragments of various rocks fused together) of mostly anorthosite. The rock sequences that make up the breccia are (i) basaltic impact melt, (ii) shocked anorthosite, (iii) shock-melted anorthosite glass and (iv) glass coat.